A timing belt also protects the piston from hitting the valves by preventing piston strikes.
An internal combustion engine’s timing belt is made from rubber and has hard teeth that can interlock with the cogwheels on the camshaft and crankshaft. It is responsible for synchronising the rotation of the crankshaft and camshaft. Each cylinder’s intake and exhaust strokes allow the engine to open and close its valves properly. A correas dentadas helps to keep the piston from hitting the valves in an interference engine by having teeth either on one or both sides.
In an interference engine, the timing belt is also toothed. The correas dentadas comprise two main components: moulded cords for carrying torque loads and plastic compounds for shaping teeth and covering the cord. Depending on the type of timing belt, these components are available in various types of materials. When selecting the material for a timing belt, it is important to consider its end use.
Timing belts usually have cords made of fibreglass, polyester, or Kevlar. Through the belt, power is transmitted to the drive system. The belt teeth and the cord are oriented at a right angle so that the belt power can be transmitted linearly. In automobile engines, serpentine belts are an example of belts that carry huge loads. Because the cord materials are so strong about the loads they transmit, belt stretch doesn’t occur practically in small drive systems.
Belt elongation is minimal in smaller drive systems. In addition to the breakage of cords, high loads can cause belt teeth to jump or cog over pulley teeth. Timing belts are constructed using a mould that contains wound cords and accurate tooth profiles, which are already cut into the mould, where the plastic is injected into the mould. Since the same number of teeth must be in the mould on the finished belt, a different mould is always available for each belt length.
As a result, the finished, continuous belt has no beginnings or ends. Timing belts are constructed using a mould that contains wound cords and accurate tooth profiles, which are already cut into the mould, where the plastic is injected into the mould. Since the same number of teeth must be in the mould on the finished belt, a different mould is always available for each belt length.
Comparatively to urethane or neoprene belts, this also ensures accurate tooth profile retention for many hours. It is important to have strong timing belt teeth that keep the crank and camshafts aligned and can be of varying pitches. On a timing belt, the pitch is the distance between the centres of the teeth that are adjacent to one another.